In October 2009, a group of US scientists published research in the journal Science that suggested that a recently discovered virus called XMRV could be linked to CFS. In their study, 68 out of 101 patients with the illness and 8 out of 218 healthy controls appeared to be infected with the virus.
However, in the study, researchers found no evidence that patients with CFS had the XMRV virus, after analysing tissue samples from 186 patients with CFS using sensitive molecular testing techniques.
This more recent analysis showed no molecular evidence for XMRV in any of the samples from CFS patients. The researchers say this means that anti-retrovirals should not be used to treat CFS, as they would be unlikely to have an effect on the symptoms. However, several labs in the US now offer CFS patients treatments based on the earlier findings that linked the condition with XMRV.
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"We are confident that our results show there is no link between XMRV and Chronic Fatigue Syndrome, at least in the UK. The US study had some dramatic results that implied people with the illness could be treated with anti-retrovirals. Our recommendation to people with Chronic Fatigue Syndrome would be not to change their treatment regime, because our results suggest that anti-retrovirals would not be an effective treatment for the condition," added Professor McClure.
http://www.scienceda...00106003615.htm